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Grade 9 Titanium vs. SAE-AISI 4340M Steel

Grade 9 titanium belongs to the titanium alloys classification, while SAE-AISI 4340M steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is grade 9 titanium and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
190
Elongation at Break, % 11 to 17
6.0
Fatigue Strength, MPa 330 to 480
690
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 40
72
Shear Strength, MPa 430 to 580
1360
Tensile Strength: Ultimate (UTS), MPa 700 to 960
2340
Tensile Strength: Yield (Proof), MPa 540 to 830
1240

Thermal Properties

Latent Heat of Fusion, J/g 410
280
Maximum Temperature: Mechanical, °C 330
430
Melting Completion (Liquidus), °C 1640
1440
Melting Onset (Solidus), °C 1590
1400
Specific Heat Capacity, J/kg-K 550
480
Thermal Conductivity, W/m-K 8.1
38
Thermal Expansion, µm/m-K 9.1
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.4
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 37
3.9
Density, g/cm3 4.5
7.8
Embodied Carbon, kg CO2/kg material 36
1.9
Embodied Energy, MJ/kg 580
26
Embodied Water, L/kg 150
55

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89 to 110
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1380 to 3220
4120
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 43 to 60
84
Strength to Weight: Bending, points 39 to 48
51
Thermal Diffusivity, mm2/s 3.3
10
Thermal Shock Resistance, points 52 to 71
70

Alloy Composition

Aluminum (Al), % 2.5 to 3.5
0
Carbon (C), % 0 to 0.080
0.38 to 0.43
Chromium (Cr), % 0
0.7 to 1.0
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.25
93.3 to 94.8
Manganese (Mn), % 0
0.65 to 0.9
Molybdenum (Mo), % 0
0.35 to 0.45
Nickel (Ni), % 0
1.7 to 2.0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.15
0
Phosphorus (P), % 0
0 to 0.012
Silicon (Si), % 0
1.5 to 1.8
Sulfur (S), % 0
0 to 0.012
Titanium (Ti), % 92.6 to 95.5
0
Vanadium (V), % 2.0 to 3.0
0.050 to 0.1
Residuals, % 0 to 0.4
0